Domestic cooking utensil



Aug. 17, 1937.

C. B. BURPEE DOMESTIC c ooKING UTENSLL Filed April 12, 1934 Patented Aug. 17, 1937 UNITED STATES PATENT OFFICE DOMESTIC COOKING UTENSIL corporation of Illinois Application April 12, 1934, Serial No. 720,183

1 Claim.

This invention pertains to the art of domestic cooking utensils, and has reference more particularly to cooking vessels employed in the making of jams, jellies, syrups, candies, and like edibles, which, for their proper preparati; .1, re-

quire the elimination of a considerable amount of Water from the raw stock in the cooking operation. Such materials, moreover, when cooked in an ordinary boiler, require constant close attention and frequent stirring to avoid burning, and the dehydration of the stock to the proper point is a slow process, especiallywhen performed in a double boiler to avoid danger of burning.

The article of my present invention is based l5 on the broad principle of the double boiler, but with certain modiiications thereof designed to eiect the main purpose or object of the invention, which is to provide an improved cooking utensil, more especially although not exclusively for edibles such as those above named, which will avoid the necessity of stirring during the cooking operation, will avoid all danger of burning, and will effect the required dehydration much more speedily than is possible with cookers now known and used.

One practical embodiment of the invention is illustrated in the accompanying drawing in which:-

Fig. 1 is a side elevation of the utensil.

Fig. 2 is an enlarged vertical section of the same, viewed on the line 2-2 of Fig. 1.

Referring to the drawing, I0 designates an outer vessel, and II an inner vessel of somewhat less diameter and depth than the outer vessel 35 adapted to occupy a position within the outer vessel such as is shown in Fig., 2. The outer vessel I0 is formed on its upper edge with an `externalrolled bead I2 formed with a tapered lower edge portion I2', and the inner vessel II is formed on its upper edge with an outwardly directed annular iiange I3, the outer portion I3 of which is oppositely tapered to the lower portion of the bead I2. The under side of the flange portion I3' is shaped to form a seat for a gasket 45 ring I4 that seats on the top edge of the bead I2,

Embracing the tapered portions I2 and I3 of the bead I2 and ange I3 respectively is a removable clamp ring I5. Any suitable and efiicient clamp ring that will effect a steam and water tight 50 joint between the upper ends of the vessels I0 and I I may be employed, but I have herein shown a clamp ring forming the subject matter of Letters Patent 1,901,699 granted March 14, 1933, to

Frank W. Burpee, to which patent. reference may 55 be had for a disclosure of the structural details.

of the invention will be fully understood from The utensil is also preferably equipped with a steam pressure gauge I6 and a vent valve II, both of which are mounted on the ange I3 and communicate with the annular space between the vessels I0 and II, which space is partially lled with water when the utensil is in use. The vent 1 valve I'I is of that type wherein the valve member may be adjusted to open at a predetermined steam pressure, and is also provided with a stem I1 by which the valve may be opened when the cooking operation is completed and the remaining steam has condensed in order to vent the vacuum within the steam chamber so that the inner vessel may be readily lifted out.

The inner vessel II is also equipped with a pair of oppositely disposed handles I8 soldered or otherwise attached to the flange I3, by which the vessel may be lifted, lowered and poured; and the outer vessel I0 is also equipped below the bead I2 with a pair of handles I9.

When using the ordinary double boiler, it is, of course, impossible to obtain a higher cooking temperature than 212 F.-the boiling point of Water. But, when using my improved utensil, the cooking temperature can be run up to around 240 F. or 250 F. As hereinbefore stated, the cooking of such edibles as jams, jellies, candies, syrups, and the like, involves the boiling off of a large percentage of the moisture contained in the stock; and the higher thecooking temperature to which the stock is subjected, the more rapid will be the dehydration of the stock, thus shortening the time period of the cooking operation. At the same time, the described construction prevents any possibility of accidental burning, so that the material does not require to be stirred.

The inner vessel II may be formed, slightly below its upper end, with an internal annular ledge or shoulder 20 to seat an extension collar 2| indicated by dotted lines in Fig. 2. It is well known that when cooking viscous substances, if the vessel containing the same be nearly filled, bubbles will creep up the sides of the vessel and sometimes spill over the top edge, and hence the purpose of the shoulder 20 is to permit the use of an extension collar which has the effect of increasing the height of the vessel II so as to prevent any bubbling or boiling over of the contents. The use of such an extension collar on ordinary cooking vessels is, however, old and known, and no claim thereto, per se, is made herein.

It is believed that the novel structural features 'or steel, but of course the particular materials of which the vessels are made are not at all of the essence of the invention; and the structural details disclosed may also be varied within the scope and purview of the appended claim.

I claim:

In a cooking utensil of the character described, the combination of an outer vessel formed with a bead on its top edge, a removable inner'vessel of less diameter and depth than said outer vessel spaced throughout its full height from the latter and formed with an external ange on its4 top edge seated on said bead, an annular gasket'be#V tween said flange and bead, a removable clamp ring embracing said iiange and bead for eiecting a water and steam tight joint between the upper ends of said vessels, and a steam pressure gauge and a Vent valve both mounted on said flange and communicating with the space between said vessels. f

CLARENCE B. BURPEE. 

